Card Set Information
Define refrigeration ton.
rate of heat removal = to cooling effect of 1 ton block of ice melting in 24 hours
Describe heat gain per pound of refrigerant in evap.
What is heat of compression?
heat removed by the condenser from refrigerant
What is latent heat?
Change of state
What is specific heat?
Heat required to raise 1lb of a substance 1 degree F.
Why subcool refrigerant prior to TXV?
Increase refrig effect by reducing flash gas.
What does the pressure of a control tubing in a TXV depend upon?
Thermal bulb attached to the tail of the evap measuring super heat.
What is the condition when liquid reaches suction line to the compressor?
Where does refrigerant absorb latent heat of vaporization?
What is the result of some burnt refrigerants?
What causes frost on compressor suction line?
TXV stuck open
What causes crank case to sweat?
What would result from oxidation of lube oil due to overheat?
What causes crank case oil to foam?
Refrigerant boiling out of solution
What do we do to prevent flashing in the liquid line?
Subcooling in the condenser.
What is refrigeration ton equal to?
An increase in _______ will cause an automatically controlled refrigeration compressor to restart.
If the compressor short cycling on high head pressure you should check for proper _______ through the condenser.
Lack of _______ may cause the compressor not start.
An increase in the heat load to a refrigeration system will cause ____________.
suction temperature to increase
Frost accumulation on the evaporator will cause the compressor to short cycle on __________.
A compressor continuously without lowering the temperature may be cause by ____________.
A shortage of refrigerant is indicated by _____________.
bubble in the sight glass
Adding refrigerant to the low side of an AC system, refrigerant should be introduced through the ________ valve as a __________.
Charging lines should be _______ before charging a refrigeration unit.
Excessive moisture collected in the purge unit of a low pressure refrigeration system could indicate ___________.
The ozone depletion factor of R-12 is _________.
When a fluid or gas contains all the heat it can without changing state, we call this _______.